phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('255ed4aa437ac7af1796deb2e2ba0959', -1, 1711727645, 1711727645, 'ae818cce', 3, 0, 0)

Line : 187
File : sessions.php